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Andrew Bartlett discovered that Samba incorrectly handled delegation ofauthority when being used as an Active Directory Domain Controller. Anattacker given delegation privileges could use this issue to escalate theirprivileges further.

Update instructions:

The problem can be corrected by updating your system to the followingpackage versions:

Ubuntu 14.10: samba 2:4.1.11+dfsg-1ubuntu2.1

Ubuntu 14.04 LTS: samba 2:4.1.6+dfsg-1ubuntu2.14.04.4

In general, a standard system update will make all the necessary changes.